[TriLUG] Shrinking docker images

[Greg Cox via TriLUG]

You might want to post a redacted Dockerfile for us to poke at.


That said, I trim a bit off my images by my package-installer RUN being:

RUN apt-get update && \
apt-get --no-install-recommends --no-install-suggests -y install PKG1 PKG2 && \
rm -rf /var/lib/apt/lists/*



> On 23 Oct 2016, at 23:48, J. S. Evans via TriLUG <trilug at trilug.org> wrote:
> 
> Is there an application that can delete non-essential parts of a docker image?  For example, I wrote a docker image to run a windows app with mono using the stock Ubuntu base image. The image works and the container that I create with it runs the app, but after the image was built, it was > 300MB. I would like to know if there is an easy way to determine what parts of the filesystem would be safe to delete.
> 
> My guess would be to run ps while it is running and delete anything that's not needed such apt/dpkg or anything in /var, /usr/local, etc.  Does anyone know of an application that I could run that would do this for me without the headache?
> 
> Jason